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28 lines
1.1 KiB
Markdown
28 lines
1.1 KiB
Markdown
# Rotate An Image To Be Oriented Upright
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Many programs that display JPEG images will read the EXIF data for
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'Orientation' headers so that they can correctly display the image. Not all of
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them though. For instance, when a browser renders an `<img>` tag for such a
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JPEG image, it won't account for the 'Orientation' header and you might end up
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with a sideways image.
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You can normalize the orientation with the
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[`jhead`](https://www.sentex.ca/~mwandel/jhead/usage.html) utility which uses
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[`jpegtran`](https://linux.die.net/man/1/jpegtran) under the hood. This is done
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with the `-autorot` flag.
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```bash
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$ jhead -autorot my_image.jpeg
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```
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> Using the 'Orientation' tag of the Exif header, rotate the image so that it
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> is upright. The program 'jpegtran' is used to perform the rotation. After
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> rotation, the orientation tag of the Exif header is set to '1' (normal
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> orientation). The Exif thumbnail is also rotated.
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> This feature is especially useful with newer digital cameras [and
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> smartphones], which set the orientation field in the Exif header
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> automatically using a built in orientation sensor in the camera.
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The image will now be upright in all programs.
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